Aviation expert Capt. Ron Alvarado, a pilot and former White House Marine helicopter commander, says security has continued to evolve in the years since the attacks.
All three security checkpoints at Philadelphia International Airport that closed last month amid the partial government shutdown have now reopened.
Operations at Philadelphia International Airport are returning to normal.
The checkpoint had been closed for two weeks due to TSA staffing shortages amid the partial government shutdown.
House Speaker Mike Johnson and Senate Majority Leader John Thune announced a plan for the Republican-controlled Congress to fully fund DHS "in the coming days."
Authorities accused the 30-year-old Marine of having a live 25mm explosive round in his checked bag at the Palm Springs International Airport.